We’ve previously covered some of the shaky foundations of Apple’s recent success. Now that the stock has dived by 40% in under a year analysts are trying to figure out what happened. One man believes he has the answer writes Jay Yarow:

Apple’s success was driven by a few key engineers who helped develop its products.

Now those individuals are considering leaving to pursue their own interests and find fame and fortune outside of the company. Their talents are wasted in developing the next incremental release of iPhone 7.

This means that the next great invention will happen outside of Apple’s walls, forcing the company to play catch up.

Read more about Apple’s troublesome internal culture, why this is the inverse of the conventional wisdom about Apple and more over here.